CN110710091B - Control device for DC/DC converter - Google Patents
Control device for DC/DC converter Download PDFInfo
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- CN110710091B CN110710091B CN201780091558.7A CN201780091558A CN110710091B CN 110710091 B CN110710091 B CN 110710091B CN 201780091558 A CN201780091558 A CN 201780091558A CN 110710091 B CN110710091 B CN 110710091B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/09—Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The circuit failure of the DC/DC converter is prevented against the failure of a voltage sensor for detecting a high-voltage-side voltage in the DC/DC converter, and the DC/DC converter can be continuously controlled. The control device (300) turns on the 2 nd switching element (104) even if one 1 st voltage sensor (201a) for detecting the high-voltage-side voltage fails, and detects a failure of the voltage sensor for detecting the high-voltage-side voltage by detecting the voltage by the 2 nd voltage sensor (201b) for detecting the high-voltage-side voltage.
Description
Technical Field
The present invention relates to a control device for a DC/DC converter.
Background
As a conventional DC/DC converter (power conversion device), there is a device that has a series circuit of a terminal group, a reactor, and a switching element and steps up and down a voltage from a battery to a motor.
The terminal group has a 1 st terminal and a 2 nd terminal, and the switching element series circuit is formed by connecting a 1 st switching element and a 2 nd switching element in series.
In a series connection body of a 1 st switching element and a 2 nd switching element, a connection point of the 1 st switching element and the 2 nd switching element is connected to a 1 st terminal via a reactor, and an opposite side of the connection point of the 1 st switching element and the 2 nd switching element is connected to a 2 nd terminal.
The 1 st terminal is set to a low voltage side, the 2 nd terminal is set to a high voltage side, and conversion of a direct current voltage is performed between the low voltage side and the high voltage side.
The DC/DC converter includes an arithmetic unit and an open/close control unit.
The calculation means calculates the calculation value based on a differential voltage between a high-voltage-side voltage command value, which is a high-voltage-side voltage command value, and a high-voltage-side voltage detection value, which is a detection value of a high-voltage-side voltage, or a differential voltage between a low-voltage-side voltage command value, which is a low-voltage-side voltage command value, and a low-voltage-side voltage detection value, which is a detection value of a low-voltage-side voltage.
The open/close control means obtains the current carrying rate from the calculated value, and controls the open/close operation of the 1 st switching element and the 2 nd switching element based on the current carrying rate (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 5457559
Disclosure of Invention
Technical problem to be solved by the invention
In a conventional DC/DC converter, the state of a high-voltage side voltage sensor is detected at any time by a voltage sensor for detecting a high-voltage side voltage, and a failure determination is made based on whether the detected value is normal or abnormal.
When the voltage sensor for detecting the high-voltage-side voltage fails, the DC/DC converter is set to the normal mode, the voltage conversion is performed by the switching process, and when the voltage sensor for detecting the high-voltage-side voltage fails, the high-voltage-side voltage cannot be detected, so that the 2 nd switching element is fixed to the on state.
When a voltage sensor for detecting the high-voltage-side voltage fails, the high-voltage-side voltage and the low-voltage-side voltage are continuously controlled while maintaining a certain relationship, but since the voltage sensor for detecting the high-voltage-side voltage fails, it is impossible to detect a change in the operation of the motor as a change in the high-voltage-side voltage during power generation and driving, and it is impossible to operate in a safe state.
As a result, when the high-voltage-side voltage becomes excessively large, the circuit of the DC/DC converter is broken, and when the high-voltage-side voltage becomes excessively small, the voltage necessary for controlling the motor becomes insufficient, and the motor falls into a state where control is impossible.
The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent a circuit failure of a DC/DC converter against a failure of a voltage sensor for detecting a high-voltage-side voltage in the DC/DC converter, and to enable continued control of the DC/DC converter.
Technical scheme for solving technical problem
A control device for a DC/DC converter according to the present invention includes a reactor having one end connected to a DC power supply, and a switching circuit including a plurality of semiconductor switching elements and connected to the other end of the reactor, the DC/DC converter converting an input voltage input from the DC power supply and outputting the converted input voltage as an output voltage, the control device comprising: a low-voltage-side voltage sensor for detecting a low-voltage-side voltage as an input voltage; a low-voltage-side voltage detector that outputs a voltage detected by the low-voltage-side voltage sensor; a 1 st high-voltage side voltage sensor for detecting a high-voltage side voltage as an output voltage; a 1 st high-voltage-side voltage detector that outputs an output voltage detected by the 1 st high-voltage-side voltage sensor; and a 2 nd high-voltage side voltage sensor for detecting a high-voltage side voltage as an output voltage; a 2 nd high-voltage-side voltage detector that outputs an output voltage detected by the 2 nd high-voltage-side voltage sensor; and a failure detection unit for detecting failures of the 1 st high-voltage side voltage sensor and the 2 nd high-voltage side voltage sensor, wherein the switching control of the on/off of each of the plurality of semiconductor switching elements is performed by using a low-voltage side detection voltage of the low-voltage side voltage detector, a 1 st high-voltage side detection voltage of the 1 st high-voltage side voltage detector, and a 2 nd high-voltage side detection voltage of the 2 nd high-voltage side voltage detector.
Effects of the invention
According to the control device of the DC/DC converter of the present invention, since the two voltage sensors for detecting the high-voltage-side voltage of the DC/DC converter are provided and the semiconductor switching element on the high-voltage side can be turned on to monitor the abnormality of the voltage sensor for detecting the high-voltage-side voltage, even if one voltage sensor for detecting the high-voltage-side voltage fails, the other voltage sensor for detecting the high-voltage-side voltage, which does not detect the failure, can monitor the failure of the high-voltage-side voltage, detect the failure of the high-voltage-side voltage, prevent the circuit failure of the DC/DC converter, and continue to control the DC/DC converter.
Drawings
Fig. 1 is a configuration diagram showing a configuration of a control device of a DC/DC converter in embodiment 1 of the present invention.
Fig. 2 is a configuration diagram showing a configuration of a DC/DC converter control device according to embodiment 2 of the present invention.
Fig. 3 is a flowchart showing an operation flow of control for estimating the high-voltage-side estimated voltage and detecting a failure of the voltage sensor in the DC/DC converter control device according to embodiment 2 of the present invention.
Fig. 4 is a diagram showing a relationship between an induced voltage and a rotation speed of a motor on a drive side in a control device for a DC/DC converter according to embodiment 2 of the present invention.
Fig. 5 is a diagram showing a relationship between an induced voltage and a rotation speed of a motor on a power generation side in a control device for a DC/DC converter according to embodiment 2 of the present invention.
Fig. 6 is a configuration diagram showing a configuration of a control device of a DC/DC converter according to embodiments 3 and 4 of the present invention.
Fig. 7 is a flowchart showing a flow of a process of detecting a failure of the voltage sensor when the induced voltage is low in the control device of the DC/DC converter according to embodiment 3 of the present invention.
Fig. 8 is a flowchart showing a flow of a process of determining a failure of a voltage sensor that detects a high-voltage-side voltage in the control device for a DC/DC converter according to embodiment 3 of the present invention.
Fig. 9 is a flowchart showing a flow of a process of determining a failure of a voltage sensor that detects a high-voltage-side voltage in the control device for a DC/DC converter according to embodiment 3 of the present invention.
Fig. 10 is a flowchart showing a flow of processing for detecting a failure of a voltage sensor for detecting a high-voltage-side voltage when the high-voltage-side estimated voltage is low in the control device for a DC/DC converter according to embodiment 4 of the present invention.
Detailed Description
Fig. 1 shows a configuration example of a control device of a DC/DC converter as an embodiment of the present invention, and first, embodiment 1 will be described.
The DC/DC converter control device according to embodiment 1 of the present invention is configured as follows.
As shown in fig. 1, a DC/DC converter (power conversion device) 100 is configured to include a reactor 102, a semiconductor module 107 including a 1 st semiconductor switching element (semiconductor switching element on the low voltage side) 103 and a 2 nd semiconductor switching element (semiconductor switching element on the high voltage side) 104 that constitute a switching circuit, and a low-voltage-side capacitor 101, and is controlled by a control device 300.
A high-voltage battery 1 as a DC power supply is connected to the low-voltage side (between the terminal 100a and the terminal 100 b) of the DC/DC converter 100, and a motor 2 is connected to the high-voltage side (between the terminal 100c and the terminal 100 d). The motor 2 includes an inverter that controls an output from the DC/DC converter 100, and the motor 2 is shown including the inverter in fig. 1. That is, the motor 2 generates power by receiving power supply from a dc power supply electrically connected to the inverter. The electric motor 2 may have a function of a generator in addition to the function of the electric motor.
Here, the inverter is a dc/ac conversion device that converts electric power between a dc power supply and the motor 2. The inverter is configured as a bridge circuit in which 2 switching elements connected in series between a positive electrode wire connected to a positive electrode of a dc power supply and a negative electrode wire connected to a negative electrode of the dc power supply are provided in 3 groups corresponding to windings of 3 phases (U-phase, V-phase, W-phase) of the motor 2. The connection point connecting the positive-side switching element and the negative-side switching element in series is connected to the corresponding phase winding. The switching element uses a chip such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) having a freewheeling diode connected in reverse parallel.
Fig. 1 shows a system with one motor, but there are also systems with two motors, in which case one motor serves as the drive side and the other motor as the power generation side.
Each of the semiconductor switching elements 103 and 104 is composed of, for example, an IGBT and a diode connected in anti-parallel therewith.
Further, the DC/DC converter 100 includes a 1 st voltage sensor 201a, a 2 nd voltage sensor 201b for detecting the high-voltage side voltage, and a voltage sensor 203 for detecting the low-voltage side voltage. In the failure detection unit 301, the value of the 1 st voltage sensor 201a for detecting the high-voltage side voltage is output to the 1 st high-voltage side voltage detector 401, the value of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage is output to the 2 nd high-voltage side voltage detector 402, and the value of the voltage sensor 203 for detecting the low-voltage side voltage is output to the low-voltage side voltage detector 403. A detection value of the current sensor 202 that detects the current flowing through the reactor 102 is input to the control device 300.
In fig. 1, a DC/DC converter (power conversion device) 100 is a bidirectional DC/DC converter capable of bidirectional power conversion between a low voltage side and a high voltage side, and boosts an input voltage (low-voltage-side voltage) input between a terminal 100a and a terminal 100b, which are terminals on the low voltage side, to a voltage equal to or higher than the input voltage (low-voltage-side voltage), and outputs the boosted output voltage (high-voltage-side voltage) between a terminal 100c and a terminal 100d, which are terminals on the high voltage side.
The 1 st semiconductor switching element 103 has one end connected to the negative electrode-side terminal of the low-voltage-side capacitor 101 and the other end connected to the positive electrode-side terminal of the low-voltage-side capacitor 101 through the reactor 102.
One end of the 2 nd semiconductor switching element 104 is connected to the other end of the 1 st semiconductor switching element 103, and the other end is connected to the positive electrode terminal of the high-voltage-side capacitor 105. The negative-side terminal of the high-voltage-side capacitor 105 is connected to one end of the 1 st semiconductor switching element 103. Further, a high-voltage side discharge resistor 106 is connected in parallel with the high-voltage side capacitor 105.
The low-voltage-side capacitor 101 smoothes the input voltage (low-voltage-side voltage). The reactor 102 is used for energy accumulation. The semiconductor module 107 boosts an input voltage (low-voltage-side voltage) to an output voltage (high-voltage-side voltage). In the present embodiment, the semiconductor switching elements 103 and 104 of the semiconductor module 107 are turned on when the gate signal is at a high level. The high-voltage-side capacitor 105 smoothes the output voltage (high-voltage-side voltage). The high-voltage side discharge resistor 106 is used to discharge the charge stored in the high-voltage side capacitor 105. The control device 300 generates gate signals of the semiconductor switching elements 103 and 104, and turns on and off the semiconductor switching elements 103 to 104.
When the failure detection unit 301 detects a failure of the 1 st voltage sensor 201a for detecting the high-voltage side voltage based on the 1 st high-voltage side detection voltage V2S detected by the 1 st high-voltage side voltage detector 401, the control device 300 turns on the 2 nd semiconductor switching element 104, and detects a failure of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage using the 2 nd high-voltage side detection voltage V2M output from the 2 nd high-voltage side voltage detector 402. Therefore, the control device 300 can turn on the 2 nd semiconductor switching element 104 and detect abnormality of the high-voltage side output voltage using the 1 st high-voltage side detection voltage V2S monitored by the 1 st high-voltage side voltage detector 401, and can continue the operation even after the 1 st voltage sensor 201a for detecting the high-voltage side voltage has failed or after the 2 nd voltage sensor 201b for detecting the high-voltage side voltage has failed.
Fig. 2 is a configuration diagram illustrating a control device of a DC/DC converter according to embodiment 2 of the present invention.
The basic configuration of the DC/DC converter control device in embodiment 2 is the same as that in embodiment 1, but in embodiment 2, as shown in fig. 2, operation information acquisition section 302 acquires operation information of motor 2 (motor rotation speed N, and switching information of second semiconductor switching element 104) and monitors the respective states. In addition, a high-voltage-side voltage estimating unit 303 is provided, and information from the 1 st high-voltage-side voltage detector 401, the 2 nd high-voltage-side voltage detector 402, and the operation information acquiring unit 302 is input.
Fig. 3 is a flowchart showing a flow of processing for explaining the method of estimating the high-voltage-side estimated voltage according to embodiment 2 of the present invention, and detecting a failure of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage and the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage from the high-voltage-side estimated voltage and the high-voltage-side detected voltage.
As shown in fig. 3, when all inverters controlling the motor 2 are in a gate-off state (step S201), an initial value of the high-voltage-side estimated voltage V2est and an initial value of the sampling period Tsamp are initially set (step S202).
The induced voltage Vtrc (drive side) of the motor is calculated from the rotation speed N of the motor, and the high-voltage-side estimated voltage V2est is calculated in the high-voltage-side voltage estimating means 303 from the initial value of the high-voltage-side estimated voltage V2est, the sampling period Tsamp, the maximum value Cmax of the high-voltage-side capacitor 105, and the maximum value Rmax of the high-voltage-side discharge resistor 106 (step S203).
When the difference between the 1 st high-voltage-side detected voltage V2S and the high-voltage-side estimated voltage V2est is equal to or greater than a predetermined value (step S204), a failure of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage is detected (step S205), and the 2 nd semiconductor switching element 104 is turned on (step S206).
When the difference between the 2 nd high-voltage-side detected voltage V2M and the high-voltage-side estimated voltage V2est is equal to or greater than a predetermined value (step S207), the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage is detected to be malfunctioning (step S208), and the 2 nd semiconductor switching element 104 is turned on (step S209).
If neither of the above conditions is satisfied, the initial value of the high-voltage-side estimated voltage V2est and the initial value of the sampling period Tsamp are set again (step S210), and the high-voltage-side estimated voltage V2est is calculated from the initial value of the high-voltage-side estimated voltage V2est and the initial value of the sampling period Tsamp (step S203). Here, the initial value V2ini of the high-voltage-side estimated voltage V2est is set to the maximum value among the high-voltage-side estimated voltage V2est, the 1 st high-voltage-side detected voltage V2S, the 2 nd high-voltage-side detected voltage V2M, the induced voltage Vtrc (driving side) of the motor, and the induced voltage Vgen (power generation side) of the motor. Further, the induced voltages Vtrc and Vgen of the motor are calculated from the rotation speed N of the motor.
As described above, since the high-voltage-side estimated voltage is not a monitored value but an estimated value, a failure can be detected without adding a sensor.
In the present embodiment, the high-voltage side discharge resistor is employed as the discharge unit, but similar effects can be obtained even with another configuration such as a constant current circuit.
Fig. 4 and 5 are diagrams showing the relationship between the induced voltage and the rotation speed of the motor in embodiment 2 of the present invention. Fig. 4 shows the relationship between the rotation speed N of the motor 2 and the induced voltage Vtrc on the drive side (power running operation state) of the motor within the range between the maximum rotation speed Nmax and the maximum induced voltage Vtrcm, and fig. 5 shows the relationship between the rotation speed N of the motor 2 and the induced voltage Vgen on the power generation side (power generation/regeneration operation state) within the range between the maximum rotation speed Nmax and the maximum induced voltage Vgen.
As shown in fig. 4 and 5, since the induced voltages Vtrc and Vgen of the motors are proportional to the rotation speed N of the motors, the induced voltages Vtrc and Vgen of the motors can be obtained from the rotation speed N of the motors, and in a system having two motors, the rotation speeds of the two motors are measured, and the induced voltages Vtrc and Vgen of the motors are obtained on the driving side and the power generation side, respectively.
Embodiment 3.
Embodiment 3 of the present invention will be explained below.
Fig. 6 is a configuration diagram illustrating a control device of a DC/DC converter according to embodiment 3 of the present invention.
The basic configuration of the control device of the DC/DC converter in embodiment 3 is the same as that in embodiment 1, but in embodiment 3, as shown in fig. 6, a battery voltage detector 404 is provided, and the battery voltage detector 404 outputs information of the voltage detected by the battery voltage sensor 204 that detects the voltage of the high-voltage battery 1. Further, a failure detector 304 is provided, which failure detector 304 receives outputs from the 1 st high-voltage-side voltage detector 401, the 2 nd high-voltage-side voltage detector 402, the low-voltage-side voltage detector 403, and the battery voltage detector 404, and detects a failure of the 1 st voltage sensor 201a and the 2 nd voltage sensor 201 b. Further, a processing unit 501 is provided to execute processing when the induced voltage of the motor 2 is low.
Fig. 7 is a diagram for explaining embodiment 3 of the present invention, and is a flowchart showing a flow of detecting a failure of a voltage sensor for detecting a high-voltage side voltage after the 2 nd semiconductor switching element 104 is turned on when the induced voltage of the motor 2 is low.
As shown in fig. 7, when the difference between the battery voltage Vbatt of the high-voltage battery 1 and the induced voltage Vtrc (driving side) of the motor is equal to or greater than a predetermined value and the difference between the battery voltage Vbatt and the induced voltage Vgen (power generation side) of the motor is equal to or greater than a predetermined value (step S501), the 2 nd semiconductor switching element 104 is turned on (step S502), and a failure determination is performed on the 1 st voltage sensor 201a for detecting the high-voltage side voltage and the 2 nd voltage sensor 201b for detecting the high-voltage side voltage (step S503).
Fig. 8 and 9 are diagrams for explaining embodiment 3 of the present invention, and are flowcharts showing the flow of failure determination of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage and the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage, and are detailed flowcharts of the failure determination processing sections of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage and the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage in step S503 in fig. 7.
As shown in fig. 8, the 1 st voltage sensor 201a for detecting the high-voltage-side voltage is detected/determined to have failed (step S602, step S603) on the basis of the condition that the absolute value of the difference between the low-voltage-side detection voltage V1 and the 1 st high-voltage-side detection voltage V2S and the absolute value of the difference between the battery voltage Vbatt and the 1 st high-voltage-side detection voltage V2S (step S601).
That is, if the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the low-voltage-side detection voltage V1 is equal to or less than a predetermined value, and the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the battery voltage Vbatt is equal to or more than a predetermined value, the failure determination condition of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage is established. Further, if the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the low-voltage-side detection voltage V1 is not equal to or less than a predetermined value, and the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the battery voltage Vbatt is not equal to or more than a predetermined value, the failure determination condition of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage is not established.
As shown in fig. 9, the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage is detected/determined to have failed (steps S702, S703) on the basis of the condition that the absolute value of the difference between the low-voltage-side detection voltage V1 and the 2 nd high-voltage-side detection voltage V2M and the absolute value of the difference between the battery voltage Vbatt and the 2 nd high-voltage-side detection voltage V2M (step S701).
That is, if the absolute value of the difference between the 2 nd high-voltage-side detection voltage V2M and the low-voltage-side detection voltage V1 is equal to or less than a predetermined value, and the absolute value of the difference between the 2 nd high-voltage-side detection voltage V2M and the battery voltage Vbatt is equal to or more than a predetermined value, the failure determination condition of the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage is established. Further, if the absolute value of the difference between the 1 st high-voltage-side detection voltage V2M and the low-voltage-side detection voltage V1 is not equal to or less than a predetermined value, and the absolute value of the difference between the 1 st high-voltage-side detection voltage V2M and the battery voltage Vbatt is not equal to or more than a predetermined value, the failure determination condition of the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage is not established.
In this way, it is determined whether or not the 1 st voltage sensor 201a for detecting the high-voltage side voltage has failed, and whether or not the 2 nd voltage sensor 201b for detecting the high-voltage side voltage has failed.
In this way, it is possible to detect a failure without adding a new sensor, and by conducting the 2 nd semiconductor switching element 104 when the induced voltages Vtrc and Vgen of the motor are low, the battery may be overcharged and the battery may be degraded when the induced voltages Vtrc and Vgen of the motor are larger than the battery voltage Vbatt due to the back electromotive force of the motor, but by conducting the 2 nd semiconductor switching element 104, it is possible to prevent the induced voltage Vtrc of the motor from being larger than the battery voltage Vbatt, and overcharge can be prevented.
Embodiment 4.
Embodiment 4 of the present invention will be explained below. The basic configuration of the DC/DC converter control device according to embodiment 4 is the same as that shown in fig. 1, but in embodiment 4, as shown in fig. 6, a processing unit 502 is provided which receives information from the high-voltage-side voltage estimating means 303 and performs processing when the high-voltage-side estimated voltage is low.
Fig. 10 is a diagram for explaining embodiment 4 of the present invention, and is a flowchart showing a flow of detecting a failure of a sensor after turning on the 2 nd semiconductor switching element 104 when the high-voltage-side estimated voltage is low.
As shown in fig. 10, when the high-voltage side estimated voltage V2est is equal to or less than a predetermined value (step S801), the 2 nd semiconductor switching element 104 is turned on (step S802), and a failure determination is performed on the 1 st voltage sensor 201a for detecting the high-voltage side voltage and the 2 nd voltage sensor 201b for detecting the high-voltage side voltage (step S803).
In addition, the failure determination processing sections of the 1 st voltage sensor 201a for detecting the high-voltage side voltage and the 2 nd voltage sensor 201b for detecting the high-voltage side voltage in fig. 10 are the same as those in the case of embodiment 3 described above.
That is, as shown in fig. 8, the 1 st voltage sensor 201a for detecting the high-voltage-side voltage is detected/determined to have failed (step S602, step S603) on the basis of the condition of the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the low-voltage-side detection voltage V1 and the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the battery voltage Vbatt (step S601).
The failure determination condition of the 1 st voltage sensor 201a for detecting the high-voltage side voltage is established if the absolute value of the difference between the 1 st high-voltage side detection voltage V2S and the low-voltage side detection voltage V1 is equal to or less than a predetermined value determined in advance, and the absolute value of the difference between the 1 st high-voltage side detection voltage V2S and the battery voltage Vbatt is equal to or more than a predetermined value determined in advance. Further, if the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the low-voltage-side detection voltage V1 is not equal to or less than a predetermined value, and the absolute value of the difference between the 1 st high-voltage-side detection voltage V2S and the battery voltage Vbatt is not equal to or more than a predetermined value, the failure determination condition of the 1 st voltage sensor 201a for detecting the high-voltage-side voltage is not established.
Further, as shown in fig. 9, the 2 nd voltage sensor 201b for detecting the high-voltage side voltage is detected/determined to have failed (step S702, step S703) according to the condition of the absolute value of the difference between the low-voltage side detection voltage V1 and the 2 nd high-voltage side detection voltage V2M (step S701).
The failure determination condition of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage is established if the absolute value of the difference between the 2 nd high-voltage side detection voltage V2M and the low-voltage side detection voltage V1 is equal to or less than a predetermined value determined in advance, and the absolute value of the difference between the 2 nd high-voltage side detection voltage V2M and the battery voltage Vbatt is equal to or more than a predetermined value determined in advance. Further, if the absolute value of the difference between the 1 st high-voltage-side detection voltage V2M and the low-voltage-side detection voltage V1 is not equal to or less than a predetermined value, and the absolute value of the difference between the 1 st high-voltage-side detection voltage V2M and the battery voltage Vbatt is not equal to or more than a predetermined value, the failure determination condition of the 2 nd voltage sensor 201b for detecting the high-voltage-side voltage is not established.
In this way, it is determined whether or not the 1 st voltage sensor 201a for detecting the high-voltage side voltage has failed, and whether or not the 2 nd voltage sensor 201b for detecting the high-voltage side voltage has failed.
As described above, even in a state where either the 1 st voltage sensor 201a for detecting the high-voltage side voltage or the 2 nd voltage sensor 201b for detecting the high-voltage side voltage is in a failure, the DC/DC converter can be safely gate-turned on in a state where there is no overvoltage.
Embodiment 5.
Embodiment 5 of the present invention will be described below. The basic configuration of the control device of the DC/DC converter in embodiment 5 is the same as that shown in fig. 1.
The detection accuracy of the 1 st voltage sensor 201a for detecting the high-voltage side voltage is higher than that of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage, and the detection delay of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage is shorter than that of the 1 st voltage sensor 201a for detecting the high-voltage side voltage. The structure of the DC/DC converter is characterized in that the output voltage is controlled using the 1 st voltage sensor 201a for detecting the high-voltage side voltage, and the inverter of the motor 2 controls the motor 2 using the 2 nd voltage sensor 201b for detecting the high-voltage side voltage. With this configuration, by dispersing the functions, it is not necessary to use sensors having the same functions, and cost reduction can be achieved.
Embodiment 6.
Embodiment 6 of the present invention will be explained below. The basic configuration of the control device of the DC/DC converter in embodiment 6 is the same as that shown in fig. 1.
The detection accuracy of the 1 st voltage sensor 201a for detecting the high-voltage side voltage is higher than that of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage, and the detection delay of the 1 st voltage sensor 201a for detecting the high-voltage side voltage is shorter than that of the 2 nd voltage sensor 201b for detecting the high-voltage side voltage. The configuration of the DC/DC converter is characterized in that the output voltage is controlled using the 1 st voltage sensor 201a for detecting the high-voltage side voltage, the inverter of the motor 2 controls the motor 2 using the 1 st voltage sensor 201a for detecting the high-voltage side voltage, and the 2 nd voltage sensor 201b for detecting the high-voltage side voltage is used when a failure of the 1 st voltage sensor 201a for detecting the high-voltage side voltage is detected. With this configuration, the 2 nd voltage sensor 201b for detecting the high-voltage side voltage can be configured at low cost.
The present invention is not limited to the above embodiments, and naturally includes all possible combinations of the embodiments. In addition, although the embodiment has been described with the configuration in which two semiconductor switching elements are provided, it is needless to say that the same effect can be obtained even with the configuration in which three or more semiconductor switching elements are used.
The present invention can freely combine the embodiments within the scope of the invention, and can appropriately modify or omit the embodiments.
Description of the reference symbols
1 high-voltage battery, 100DC/DC converter, 101 low-voltage side capacitor, 102 reactor, 103 1 st semiconductor switching element (low-voltage side semiconductor switching element), 104 nd 2 nd semiconductor switching element (high-voltage side semiconductor switching element), 105 high-voltage side capacitor, 106 high-voltage side discharge resistance, 201a 1 st voltage sensor, 201b 2 nd voltage sensor, 203 voltage sensor, 204 battery voltage sensor, 300 control device, 301 fault detection unit, 302 operation information acquisition unit, 303 high-voltage side voltage estimation unit, 304 fault detector, 401 1 st high-voltage side voltage detector, 402 nd 2 nd high-voltage side voltage detector, 403 low-voltage side voltage detector, 404 battery voltage detector, 501, 502 processing unit.
Claims (5)
1. A control device for a DC/DC converter,
the DC/DC converter has a reactor having one end connected to a DC power supply, and a switching circuit including a plurality of semiconductor switching elements and connected to the other end of the reactor,
the DC/DC converter converts an input voltage input from the DC power supply and outputs the converted input voltage as an output voltage, and the control device for the DC/DC converter includes:
a low-voltage-side voltage sensor for detecting a low-voltage-side voltage as the input voltage;
a low-voltage-side voltage detector that outputs a voltage detected by the low-voltage-side voltage sensor;
a 1 st high-voltage-side voltage sensor for detecting a high-voltage-side voltage as the output voltage;
a 1 st high-voltage-side voltage detector that outputs a voltage detected by the 1 st high-voltage-side voltage sensor;
a 2 nd high-voltage side voltage sensor for detecting a high-voltage side voltage as the output voltage;
a 2 nd high-voltage-side voltage detector that outputs a voltage detected by the 2 nd high-voltage-side voltage sensor; and
a failure detection unit that detects a failure of the 1 st high-voltage side voltage sensor and the 2 nd high-voltage side voltage sensor,
on/off of each of the plurality of semiconductor switching elements is switched and controlled by a low-voltage-side detection voltage of the low-voltage-side voltage detector, a 1 st high-voltage-side detection voltage of the 1 st high-voltage-side voltage detector, and a 2 nd high-voltage-side detection voltage of the 2 nd high-voltage-side voltage detector,
detecting a failure of a high-voltage-side voltage sensor for detecting a corresponding high-voltage-side voltage by comparing the 1 st or 2 nd high-voltage-side detected voltage with the high-voltage-side estimated voltage, and when a failure of one of the high-voltage-side voltage sensors for detecting a high-voltage-side voltage is detected,
turning on a semiconductor switching element on a high voltage side connected between the reactor terminal and a high potential side of the DC/DC converter, and,
the abnormality of the output voltage is detected by a high-voltage-side detection voltage output by a high-voltage-side voltage detector corresponding to a high-voltage-side voltage sensor for detecting a high-voltage-side voltage on the side where the fault is not detected.
2. The control device of a DC/DC converter according to claim 1,
the failure of the high-voltage-side voltage sensor is detected by a high-voltage-side detection voltage output by a high-voltage-side voltage detector corresponding to a high-voltage-side voltage sensor for detecting a high-voltage-side voltage, the high-voltage-side voltage sensor not having detected the failure, and a low-voltage-side detection voltage output by a low-voltage-side voltage detector corresponding to the low-voltage-side voltage sensor.
3. The control device of a DC/DC converter according to claim 2,
when the induced voltage information of the motor indicating the induced voltage calculated from the rotation speed of the motor connected to the DC/DC converter and the drive information indicating the switching state of the high-voltage side semiconductor switching element indicate that the high-voltage side semiconductor switching element is in the fixed-off state,
a high-voltage-side voltage is estimated from information on an induced voltage applied to a discharge resistor of the DC/DC converter, and a value of the discharge resistor and a value of a high-voltage-side capacitor of the DC/DC converter.
4. The control device of a DC/DC converter according to claim 2,
includes an operation information acquiring unit for acquiring induced voltage information of a motor indicating an induced voltage of the motor connected to the DC/DC converter,
when a difference between the low-voltage-side detection voltage and an induced voltage of the motor is equal to or less than a predetermined value, a semiconductor switching element on the high-voltage side connected between the reactor terminal and a high-potential side of the DC/DC converter is turned on,
detecting a failure of the high-voltage-side voltage sensor by comparing the low-voltage-side detection voltage with the high-voltage-side detection voltage.
5. The control device of a DC/DC converter according to claim 4,
the high-voltage-side voltage estimating device further includes a high-voltage-side voltage estimating unit that estimates a high-voltage-side voltage from the induced voltage information of the motor and the drive information indicating the switching state of the high-voltage-side semiconductor switching element, and turns on the high-voltage-side semiconductor switching element connected between the reactor terminal and the high potential side of the DC/DC converter when the high-voltage-side estimated voltage of the DC/DC converter obtained by the high-voltage-side voltage estimating unit is equal to or less than a predetermined value determined in advance.
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| PCT/JP2017/021425 WO2018225235A1 (en) | 2017-06-09 | 2017-06-09 | Control device for dc-dc converter |
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| US (1) | US11025165B2 (en) |
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| JP6858834B1 (en) * | 2019-12-11 | 2021-04-14 | 三菱電機株式会社 | Power converter control device |
| JP7150122B1 (en) * | 2021-10-26 | 2022-10-07 | 三菱電機株式会社 | power converter |
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| WO2016167185A1 (en) * | 2015-04-17 | 2016-10-20 | 日立オートモティブシステムズ株式会社 | In-vehicle control device |
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| JP6121018B1 (en) * | 2016-03-23 | 2017-04-26 | 三菱電機株式会社 | DC / DC converter |
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| DE112011102550T5 (en) | 2010-07-30 | 2013-05-02 | Mitsubishi Electric Corporation | DC / DC converter |
| JP5383614B2 (en) * | 2010-09-15 | 2014-01-08 | 株式会社東芝 | Vehicle drive system |
| JP2016116262A (en) * | 2014-12-11 | 2016-06-23 | トヨタ自動車株式会社 | Driving device |
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- 2017-06-09 WO PCT/JP2017/021425 patent/WO2018225235A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1841078A (en) * | 2005-03-30 | 2006-10-04 | 丰田自动车株式会社 | Fault diagnosing apparatus for vehicle and fault diagnosing method for vehicle |
| JP2013211983A (en) * | 2012-03-30 | 2013-10-10 | Toyota Motor Corp | Electric vehicle and control method of the same |
| WO2016167185A1 (en) * | 2015-04-17 | 2016-10-20 | 日立オートモティブシステムズ株式会社 | In-vehicle control device |
| JP2017005883A (en) * | 2015-06-11 | 2017-01-05 | 三菱電機株式会社 | Control device for power conversion apparatus |
| JP6121018B1 (en) * | 2016-03-23 | 2017-04-26 | 三菱電機株式会社 | DC / DC converter |
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| CN110710091A (en) | 2020-01-17 |
| WO2018225235A1 (en) | 2018-12-13 |
| DE112017007626T5 (en) | 2020-05-07 |
| US20200153333A1 (en) | 2020-05-14 |
| US11025165B2 (en) | 2021-06-01 |
| JPWO2018225235A1 (en) | 2020-02-27 |
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